100221001031 has 2 divisors, whose sum is σ = 100221001032. Its totient is φ = 100221001030.

The previous prime is 100221001009. The next prime is 100221001033. The reversal of 100221001031 is 130100122001.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100221001031 is a prime.

It is a super-2 number, since 2×100221001031² (a number of 23 digits) contains 22 as substring.

Together with 100221001033, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100221001033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50110500515 + 50110500516.

It is an arithmetic number, because the mean of its divisors is an integer number (50110500516).

Almost surely, 2^100221001031 is an apocalyptic number.

100221001031 is a deficient number, since it is larger than the sum of its proper divisors (1).

100221001031 is an equidigital number, since it uses as much as digits as its factorization.

100221001031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 100221001031 its reverse (130100122001), we get a palindrome (230321123032).

The spelling of 100221001031 in words is "one hundred billion, two hundred twenty-one million, one thousand, thirty-one".